Figure 6:

(A) Measurements of haemoglobin saturation (sO₂) with the i-STAT system vs. control sO₂ calculated by the Tucker method. (B) The relative error of i-STAT sO₂ measurements, δsO₂ (expressed as a %), [calculated as: (i-STAT sO₂ − control HCO₃⁻)/control sO₂ × 100] vs. control sO₂. Continuous lines represent the fitted models and dashed lines represent the lines of identity. (C) Effects of temperature (in °C), Hct (L, low; H, high) and PCO₂ (in mmHg) on δsO₂ (expressed as a %). Significant effects within treatments are indicated as ‘*’ at the P < 0.05 level. Data are means ± SEM, and statistical analysis was performed on the absolute δsO₂ values.